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P a g e 1 2 • D R I - S T E E M D e s i g n G u i d e
D R I - S T E E M D e s i g n G u i d e • P a g e 1 3
C a l c u l a t i n g h u m i d i f i c a t i o n l o a d
u s i n g S I ( S y s t è m e I n t e r n a t i o n a l )
u n i t s o f m e a s u r e
DRI-CALC software will calculate load for you
The easiest way to calculate humidification load is to use
DRI-CALC, DRI-STEEM’s humidification system sizing and
selection software. The software not only sizes loads, but also selects
equipment, writes specifications, creates equipment schedules, and
provides as-configured installation instructions for DRI-STEEM
products.
Note: DRI-CALC Europe Version 3, with the capabilities described
above, will be released in Europe in 2003.
Methods for calculating humidification load
DRI-CALC uses the following methods for calculating load. Read
through the examples in this section to learn how to manually
calculate load using these same methods:
• Natural ventilation method
• Mechanical ventilation method
DRI-CALC also calculates load using the economizer cycle method,
which is not described in this section
Natural ventilation method
As a general rule, humidification load is based only on the amount
of air entering a building or space. In buildings without mechanical
ventilation systems, humidification load is usually calculated using
the air change method. Buildings can be classified by number of
air changes per hour, with typical air changes being 1, 1, or 2
air changes per hour. See the chapter on natural ventilation and
infiltration in the ASHRAE Fundamentals Handbook (available
at www.ashrae.org) for more information about calculating air
infiltration. For noncritical applications, we typically use 1 air
changes per hour for calculating load.
Important notes
about calculating load
• When outside air is 10% or less, it is
wise to calculate the load twice. The
first calculation should be made on the
basis of air changes due to mechanical
ventilation; the second should be based
on the natural ventilation method.
Use the larger of the two results for
determining the load.
• Vapor naturally migrates from areas
with high vapor pressure to areas with
low vapor pressure, regardless of air
movement. Vapor retarders reduce vapor
migration, but should only be installed in
accordance with local codes.
- HUMIDIFICATION SYSTEM 1
- DESIGN GUIDE 1
- For more information 2
- More tools on the next page u 6
- Table 6-1: 10
- Figure 8-1: 12
- Table 9-1: 13
- Outside air percentages with 13
- Table 11-1: 15
- Table 12-1: 16
- Grams of moisture per m 19
- /h at sea level 19
- Table 15-1: 19
- S t e a m l o s s 21
- Steam loss in kg/h/m 22
- Steam loss in lbs/hr/ft 23
- H e a t g a i n 27
- Heat gain in °C 28
- Heat gain in °F 29
- Heat gain in °F and °C 31
- Table 28-1: 32
- Table 29-1: 33
- Table 32-1: 36
- Figure 34-1: 38
- How a water softener works 38
- Figure 34-2: 38
- Figure 35-1: 39
- Figure 35-2: 39
- Two-tank DI system 39
- Table 38-1: 42
- 3 keypad) 43
- Evaporating chamber 45
- Space Distribution Unit (SDU) 45
- Figure 42-1: 46
- VAPORSTREAM electric system 46
- Figure 42-2: 46
- VAPOR-LOGIC3 keypad 46
- Figure 43-1: 47
- STS Steam-to-Steam system 47
- Figure 44-1: 48
- Standard water systems 48
- Figure 44-2: 48
- DI/RO water systems 48
- Figure 45-1: 49
- Figure 45-2: 49
- Figure 47-1: 51
- Steam injection humidifiers 51
- Section Y-Y 52
- Section X-X 52
- Condensate 52
- Figure 50-1: 54
- 1995 ASHRAE Handbook, HVAC 56
- Applications 56
- Figure 53-2: 57
- Figure 53-3: 57
- Detail of conductivity probe 57
- Figure 60-1: 64
- Figure 61-1: 65
- Figure 62-1: 66
- Recommended sensor locations 66
- Install level 67
- Pitch 1/8"/ft 67
- Table 64-1: 68
- Table 64-2: 68
- Table 65-1: 69
- Figure 66-1: 70
- Figure 67-1: 71
- Elevating condensate 71
- Figure 68-1: 72
- Single humidifying steam path 72
- Figure 69-1: 73
- S u m m a r y 74
- 3 controller 80
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